Interesting.
http://www.takepart.com/article/2013...-air-pollution
"With China's notoriously polluted air reaching unprecedented levels of dirtiness in recent weeks, it's been nearly impossible for outdoor enthusiasts to walk, jog, run, rollerblade, or hop-scotch without the very real possibility of returning home with a mouthful of soot.
Enter British artist Matt Hope, who's designed a Breathing Bicycle that he believes will make bike riding a healthy transportation option for China's residents.
Here's how it works: A generator is connected to the back wheel, which with each pedal sucks air into a filtration system that separates out dust particles. The clean air is then sent up to the rider who can ride comfortably in Beijing's polluted air.
The bike is a self-sustainable air-cleaning system, but there are still a few kinks to be worked out--namely that it cannot operate in the rain. While the technology works in theory, the bike still needs some testing and reinventing before it becomes commercially ready."
We might need something like that in some of our cities during rush hour too.
Cheers